干旱区生态环境知识资源中心(Arid): Shedding of a condensing droplet from beetle-inspired bumps

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DOI	10.1016/j.ijheatmasstransfer.2019.07.037
	Shedding of a condensing droplet from beetle-inspired bumps
	Ahmad, Shakeel; Tang, Hui; Yao, Haimin
通讯作者	Tang, Hui
来源期刊	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
ISSN	0017-9310
EISSN	1879-2189
出版年	2019
卷号	141 页码:1087-1096
英文摘要	Inspired by Namib desert beetle's bumpy structures, condensing droplet shedding from various super-hydrophobic bumps with a hydrophilic patch present on their top was numerically studied using the lattice Boltzmann method (LBM). The droplet grows on the top patch due to condensation and then sheds from the bump due to gravity. A parametric study has been conducted. It was revealed that the bump shape, diameter, height, inclination and wettability all affect the shedding volume (volume at which the droplet sheds from the bump) of the droplet. The shedding volume decreases with the bump height till a threshold height, defined as the critical bump height, beyond which the shedding volume does not change any more. With the same patch area, the shedding volume is smaller on the bump with a hemispherical top compared to the bump with a circular cylindrical top. The shedding volume increases with bump diameter, but decreases with the patch contact angle and surface inclination angle. The same trends were also found for the critical bump height. Furthermore, compared to milli-scale bumps, droplet removal followed by shedding on micro-scale bumps was found to be inefficient. Based on the simulation results, a scaling law was obtained by data fitting to estimate the critical bump height for bumps with a cylindrical top, which can be used to guide the design of desert-beetle-inspired bumps for efficient water collection from fog. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	Hydrophilic/super-hydrophobic bump Droplet shedding volume Critical bump height Lattice Boltzmann method
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000480665000091
WOS关键词	LATTICE BOLTZMANN METHOD ; SUPERHYDROPHOBIC SURFACE ; DROPWISE CONDENSATION ; WATER ; MIMICKING ; SIMULATION
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216456
作者单位	Hong Kong Polytech Univ, Res Ctr Fluid Struct Interact, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Ahmad, Shakeel,Tang, Hui,Yao, Haimin. Shedding of a condensing droplet from beetle-inspired bumps[J],2019,141:1087-1096.
APA	Ahmad, Shakeel,Tang, Hui,&Yao, Haimin.(2019).Shedding of a condensing droplet from beetle-inspired bumps.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,141,1087-1096.
MLA	Ahmad, Shakeel,et al."Shedding of a condensing droplet from beetle-inspired bumps".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 141(2019):1087-1096.